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Saskatchewan
Canada
Agricultural Workers' Diseases
Occupational Exposure
Asthma
Environmental Exposure
Respiratory Tract Diseases
Smoking
Questionnaires
Respiratory Function Tests
Forced Expiratory Volume
Vital Capacity
Agriculture
Risk Factors
Cross-Sectional Studies
Rural Population
Logistic Models
Dust
Cereals
Animal Husbandry
Co-Publications
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